Stainless Steel 304 Cast Pipe Fitting, Square Head Cored Plug, MSS SP-114, 3/4" NPT Male Square head cored plug for closing and terminating the end of a pipe Male National Pipe Taper (NPT) threads for use with female threaded pipes Made of stainless steel 304 for greater strength than 302 grade steel Square head for increased leverage and use with a wrench Meets standards MSS SP-114, ANSI B1.20.1, and ASTM A351 for quality assurance